This is the bonus cache for the Donald Forster Outdoor Sculpture Park Adventure lab.
In order to determine the coordinates for this hide, you need to complete the nearby Adventure Lab. The North coordinates will be found in the journal entry for one of the locations, and the West coordinates in the journal entry for another of the locations. You will be looking for a magnetic nano at the final. Watch out for muggles!
Optional: I would love to see photos of the Begging Bear sculpture from the Adventure Lab in your logs for this hide!
Please - no spoiler photos of the final location of this hide.